I am new to Tennis. So a coach is telling me the racket face is closed at 45 degrees during contact. This is talking about hitting balls at waist height. But from the video of pros hitting this does not seem to be the case. The other thing he says is to tuck the elbow of the hitting arm to the side of the body during the takeback. So you end up using the forearm to make the loop. Is this how to hit the forehand? I am asking because what he says doesn't sound like the instruction I am finding on here and on youtube, but he does have a coaching certificate.